Vapor injection device and compressor

ABSTRACT

Provided are a vapor injection device and a compressor. The vapor injection device includes an injector valve plate, an injector plate, and an injector reed valve. One side of the injector plate facing toward the injector valve plate is provided with an avoidance groove. A guide post is disposed protruding from one side of the injector plate facing away from the injector valve plate. The guide post is inserted into a fixed scroll of the compressor and provided with an injection channel. A vapor injection inlet cavity is formed between the rear housing, the injector valve plate, and the fixed scroll. The injector reed valve is disposed between the injector valve plate and the injector plate and attaches to the injector valve plate, the injector reed valve is provided with a movable sheet, and the movable sheet, the injector valve plate and the avoidance groove form a one-way valve structure.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims priority to Chinese Patent Application No. 202110292863.0 filed Mar. 18, 2021, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of air condition compressors, in particular, a vapor injection device and a compressor.

BACKGROUND

In the field of automobiles, a compressor is typically used as a device for compressing a refrigerant. Different from the traditional fossil-fuelled vehicles, electric vehicles have no engine and most of the electric vehicles use PTC heating, and thus the heating efficiency of the electric vehicle is low. Therefore, it is necessary to adopt a heat pump system to satisfy the heating requirements of vehicles in a low-temperature environment. As a consequence, in addition to refrigeration requirements for a low-temperature heat pump electric compressor, the low-temperature heat pump electric compressor further needs to provide larger heating capacity and higher efficiency in the low-temperature environment. However, a conventional electric vortex compressor has a too low suction pressure in a low-temperature environment below −20° C., which results in insufficient heating capacity and a too high exhaust temperature. Therefore, the problems such as low working efficiency, wear between mechanical parts due to long-term operation, failure of refrigerant oil exist.

In order to solve the problems, an existing compressor utilizes a vapor injection assembly to implement the function of supplying air. The vapor injection assembly includes a cover plate, a one-way valve, a sealing gasket and a bolt. The vapor injection assembly has a complex structure so that the volume and the weight of the compressor are increased, the assemblability gets worse, and production processes become more, thus leading to higher production cost. Meanwhile, the one-way valve structure leads to excessive pressure drop, and the excessive pressure drop leads to the delay of vapor injection and affects the efficiency of the compressor.

SUMMARY

Aspects of the present disclosure provide a vapor injection device and a compressor to ensure the compression effect in a low-temperature environment, and the structure is simple and the production cost is low.

In an aspect, provided is a vapor injection device used for vapor injection of a compressor. A rear housing of the compressor is provided with a vapor injection port. The vapor injection device includes an injector valve plate, an injector plate, and an injector reed valve.

In an aspect, the injector valve plate is disposed in the rear housing, and the injector valve plate is provided with a via hole.

In an aspect, the injector plate is disposed in the rear housing, one side of the injector plate facing toward the injector valve plate is provided with an avoidance groove, a guide post is provided with protruding from one side of the injector plate facing away from the injector valve plate, the guide post is inserted into a fixed scroll of the compressor, an injection channel is disposed in the guide post, and a vapor injection inlet cavity is formed between the rear housing, the injector valve plate, and the fixed scroll.

In an aspect, the injector reed valve is disposed between the injector valve plate and the injector plate. The injector reed valve is attached to the injector valve plate. The injector reed valve is provided with a movable sheet, and the movable sheet, the injector valve plate and the avoidance groove form a one-way valve structure such that a vapor injection refrigerant entering from the vapor injection port sequentially passes through the vapor injection inlet cavity, the via hole and the one-way valve structure and enters the fixed scroll through the injection channel.

In an aspect, a movable gap is disposed between the movable sheet and the injector reed valve, and the movable gap has a U-shaped structure.

In an aspect, the vapor injection device further includes a first sealing ring, and the first sealing ring is sleeved on the injector plate and disposed between the injector plate and an inner wall of the rear housing.

In an aspect, the first sealing ring is configured to divide the inner wall of the rear housing into the vapor injection inlet cavity and an exhaust high-pressure cavity.

In an aspect, the vapor injection device further includes a second sealing ring, and the second sealing ring is sleeved on the guide post and disposed between the injector plate and the fixed scroll.

In an aspect, the vapor injection device further includes a positioning member, and the positioning member extends into the injector plate, the injector reed valve, and the injector valve plate.

In an aspect, the vapor injection device further includes a snap spring, and the snap spring is sleeved on the injector plate and disposed between the injector plate and the rear housing to limit an axial position of the injector plate.

To achieve the above-mentioned aspects, the present disclosure further provides a compressor including a body, an orbit scroll, a fixed scroll, a rear housing and the above-mentioned vapor injection device which are sequentially connected. A suction port is disposed on the body, the orbit scroll is disposed in the body and rotatable relative to the fixed scroll, and the vapor injection device is disposed between the fixed scroll and the rear housing and configured to supply air to the fixed scroll.

In an aspect, one side of the fixed scroll facing toward the orbit scroll is provided with a fixed scroll plate, one side of the orbit scroll facing toward the fixed scroll is provided with an orbit scroll plate, a compression cavity is formed between the fixed scroll plate and the orbit scroll plate, and the compression cavity is in communication with the suction port and the vapor injection device.

In an aspect, a bottom of the fixed scroll plate is provided with an injection hole, and the vapor injection device is in communication with the injection hole.

According to the vapor injection device provided by an aspect of the present disclosure, when it is necessary to supply air, the vapor injection refrigerant enters the vapor injection inlet cavity through the vapor injection port and flows into the via hole of the injector valve plate such that a pressure difference exists between two sides of the injector reed valve. In this manner, the movable sheet on the injector reed valve opens towards the injector plate, the vapor injection refrigerant enters the injector plate, the guide post of the injector plate guides the vapor injection refrigerant into the injection hole of the fixed scroll, and the vapor injection refrigerant is jetted into the compression cavity through the injection hole for secondary compression. The guide post is directly docked to the fixed scroll such that the reliability of the vapor injection refrigerant transmission is ensured. The injection channel is disposed in the guide post 22 such that the optimization of the air flow channel is achieved. The injection channel has a linear structure such that the bending in the flow of the vapor injection refrigerant is reduced, and thus the pressure drop is reduced and a higher vapor injection efficiency is obtained.

In an aspect of the present disclosure, the one side of the injector plate facing toward the injector valve plate is provided with the avoidance groove such that the avoidance groove plays a role in avoiding the movable sheet. A free end of the movable sheet moves in a direction away from the injector reed valve so that the vapor injection refrigerant flowing out of the via hole of the injector valve plate can enter the gap between the movable sheet and the injector reed valve. The avoidance groove provides a moving space for the movable sheet so as to ensure that the movable sheet opens in the direction toward the injector plate. The injector reed valve is disposed between the injector valve plate and the injector plate and attaches to the injector valve plate such that the injector valve plate plays a role in limiting an opening direction of the movable sheet. If the free end of the movable sheet moves toward the injector valve plate, the injector valve plate has a flat plate structure, so it is difficult for the injector valve plate to provide a moving space for the movable sheet. In this manner, the movable sheet can be opened only in a direction facing toward the injector plate, and the air in the compression cavity is prevented from flowing backward into the vapor injection inlet cavity. Compared with a spring one-way valve of the related art, the one-way valve structure formed by the movable sheet, the injector valve plate and the avoidance groove does not need to be provided with parts such as a spring and a bolt, thereby reducing the number of parts and complexity, simplifying the structure of parts, reducing the cost, and meanwhile improving the sensitivity and stability.

In an aspect of the present disclosure, in the vapor injection device, the rear housing of the compressor is provided with the vapor injection port, and a part of the medium and high pressure refrigerant in the system is directly introduced into the compression cavity of the compressor through the vapor injection device to increase the flow rate of the refrigerant so that the compressor can obtain higher heating capacity in a low-temperature environment.

In an aspect of the present disclosure, a compressor is provided, and the vapor injection device is configured to supply air to the fixed scroll. Under the joint action of the vapor injection port and the vapor injection device, the function of vapor injection of a suction port is achieved so that sufficient supply of refrigerant can be ensured, thereby solving the problem of insufficient heating in the low-temperature environment and ensuring the working efficiency of the compressor.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a structural schematic view of a compressor according to an aspect of the present disclosure;

FIG. 2 is an exploded view of the compressor according to an aspect of the present disclosure;

FIG. 3 is a cross-sectional view of a fixed scroll and an orbit scroll in the compressor according to an aspect of the present disclosure;

FIG. 4 is a partial cross-sectional view of a vapor injection device according to an aspect of the present disclosure; and

FIG. 5 is a structural schematic view of an injector plate of the vapor injection device according to an aspect of the present disclosure.

REFERENCE LIST

100 body

101 suction port

200 orbit scroll

201 orbit scroll plate

300 fixed scroll

301 fixed scroll plate

302 injection hole

400 rear housing

401 exhaust port

402 vapor injection port

500 compression cavity

1 injector valve plate

2 injector plate

3 injector reed valve

4 vapor injection inlet cavity

5 first sealing ring

6 second sealing ring

7 positioning member

8 snap spring

9 exhaust high-pressure cavity

11 via hole

21 avoidance groove

22 guide post

221 injection channel

31 movable sheet

DETAILED DESCRIPTION

To clarify solved problems, adopted solutions and achieved effects of the present disclosure, aspects of the present disclosure will be further described in conjunction with the drawings. Apparently, the aspects described below are part, not all, of aspects of the present disclosure. Based on aspects of the present disclosure, all other aspects obtained by those skilled in the art are within the scope of the present disclosure on the premise that no creative work is done.

In the description of the present disclosure, unless otherwise expressly specified and limited, terms “connected to each other”, “connected” or “fixed” are to be construed in a broad sense, for example, as permanently connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected or interactional between two components. For those of ordinary skill in the art, specific meanings of the above terms in the present disclosure may be understood based on specific circumstances.

In the present disclosure, unless otherwise expressly specified and limited, when a first feature is described as “above” or “below” a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features. Moreover, when the first feature is described as “on”, “above” or “over” the second feature, the first feature is right on, above or over the second feature or the first feature is obliquely on, above or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as “under”, “below” or “underneath” the second feature, the first feature is right under, below or underneath the second feature or the first feature is obliquely under, below or underneath the second feature, or the first feature is simply at a lower level than the second feature.

Aspects of the present disclosure will be further described below in conjunction with the drawings.

In one aspect, a compressor is provided. As shown in FIG. 1, the compressor includes a body 100 and a rear housing 400 connected to the body 100, the body 100 is provided with a suction port 101, and the rear housing 400 is provided with an exhaust port 401. The suction port 101 is a main intake passage. Refrigerant is sucked into the body 100 from the suction port 101 and discharged from the exhaust port 401 after air compression is completed. In order to fully compress the air, as shown in FIG. 2, an accommodation cavity is formed between the body 100 and the rear housing 400. The accommodation cavity is used for accommodating a motor, an orbit scroll 200 and a fixed scroll 300. The motor drives the orbit scroll 200 to rotate relative to the fixed scroll 300 through a crankshaft so as to compress the refrigerant.

In an aspect, as shown in FIG. 3, one side of the fixed scroll 300 facing toward the orbit scroll 200 is provided with a fixed scroll plate 301, and the fixed scroll plate 301 extends outwardly along a vortex line structure from a center of the fixed scroll 300. One side of the orbit scroll 200 facing toward the fixed scroll 300 is provided with an orbit scroll plate 201, and the orbit scroll plate 201 extends outwardly along a vortex line structure from the center of the fixed scroll 300. A compression cavity 500 is formed between the fixed scroll plate 301 and the orbit scroll plate 201, and the compression cavity 500 communicates with the suction port 101. The refrigerant sucked from the suction port 101 enters the compression cavity 500 and is guided to a center of the fixed scroll 300 along a sidewall of the orbit scroll plate and a sidewall of the fixed scroll plate under the guidance of the fixed scroll plate 301 and the orbit scroll plate 201. In this manner, the purpose of compressing the refrigerant is achieved while the refrigerant is converged. An exhaust hole is provided at the center of the fixed scroll 300, and the exhaust hole communicates with the exhaust port 401 to discharge the compressed refrigerant.

The compressor has a lower suction pressure in the low-temperature environment thus leading to insufficient heating. As shown in FIGS. 1 and 2, a vapor injection port 402 is disposed on the rear housing 400, a vapor injection device is disposed between the fixed scroll 300 and the rear housing 400, and the vapor injection port 402 communicates with the vapor injection device. The vapor injection device is configured to supply air to the fixed scroll 300. Under the joint action of the vapor injection port 402 and the vapor injection device, the function of vapor injection of a suction port 101 is achieved so that sufficient supply of refrigerant can be ensured, thereby solving the problem of insufficient heating in the low-temperature environment and ensuring the working efficiency of the compressor.

In an aspect, in order to implement the vapor injection of the vapor injection device to the fixed scroll 300, as shown in FIG. 3, a bottom of the fixed scroll plate 301 is provided with an injection hole 302, and the vapor injection device communicates with the injection hole 302. The bottom of the fixed scroll plate 301 is provided with the injection hole 302 such that the vapor injection refrigerant enters the compression cavity 500 through the injection hole 302 to implement the secondary compression of the refrigerant. It is to be understood that an aperture size of the injection hole 302 is not limited in this aspect and can be adjusted according to the actual demand for the heating capacity to satisfy the user demand.

Aiming at the problems of complex structure and poor vapor injection effect of the existing vapor injection assembly, an aspect of the present disclosure provides a vapor injection device used for vapor injection of the compressor. As shown in FIGS. 2 and 4, the vapor injection device includes an injector valve plate 1, an injector plate 2, and an injector reed valve 3, and the injector valve plate 1, the injector reed valve 3, and the injector plate 2 are sequentially superposed inside the rear housing 400. The rear housing 400 plays a role in accommodating and integral supporting. One side of the injector plate 2 facing toward the injector valve plate 1 is provided with an avoidance groove 21 (as shown in FIG. 5), a guide post 22 is provided protruding from one side of the injector plate 2 facing away from the injector valve plate 1, and the guide post 22 has a cylindrical structure and is inserted into the fixed scroll 300 of the compressor. In an aspect, the guide post 22 is inserted into the injection hole 302 of the fixed scroll 300.

As shown in FIGS. 2 and 4, an injection channel 221 is disposed inside the guide post 22. The injector reed valve 3 is disposed between the injector valve plate 1 and the injector plate 2 and attaches to the injector valve plate 1. The injector reed valve 3 is provided with a movable sheet 31, and the movable sheet 31, the injector valve plate 1 and the avoidance groove 21 form a one-way valve structure. The injector valve plate 1 is provided with a via hole 11, a vapor injection inlet cavity 4 is formed between the rear housing 400, the injector valve plate 1, and the fixed scroll 300 such that the air entering from the vapor injection port 402 sequentially passes through the vapor injection inlet cavity 4, the via hole 11, and the one-way valve structure and enters the fixed scroll 300 through the injection channel 221.

According to the vapor injection device provided by an aspect of the present disclosure, when it is necessary to supply air, the vapor injection refrigerant enters the vapor injection inlet cavity 4 through the vapor injection port 402 and flows into the via hole 11 of the injector valve plate 1 such that a pressure difference exists between two sides of the injector reed valve 3. In this manner, the movable sheet 31 on the injector reed valve 3 opens towards the injector plate 2, the vapor injection refrigerant enters the injector plate 2, the guide post 22 of the injector plate 2 guides the vapor injection refrigerant into the injection hole 302 of the fixed scroll 300, and the vapor injection refrigerant is jetted into the compression cavity 500 through the injection hole 302 for the secondary compression. The guide post 22 is directly docked to the fixed scroll 300 such that the reliability of the vapor injection refrigerant transmission is ensured. The injection channel 221 is disposed in the guide post 22 such that the optimization of the air flow channel is achieved. The injection channel 221 has a linear structure such that the bending in the flow of the vapor injection refrigerant is reduced, and thus the pressure drop is reduced and a higher vapor injection efficiency is obtained.

The one side of the injector plate 2 facing toward the injector valve plate 1 is provided with the avoidance groove 21 such that the avoidance groove 21 plays a role in avoiding the movable sheet 31. A free end of the movable sheet 31 moves in a direction away from the injector reed valve 3 so that the vapor injection refrigerant flowing out of the via hole 11 of the injector valve plate 1 can enter the gap between the movable sheet 31 and the injector reed valve 3. The avoidance groove 21 provides a moving space for the movable sheet 31 so as to ensure that the movable sheet 31 opens in the direction toward the injector plate 2. In an aspect, a bottom of the avoidance groove 21 is provided with a slope having a certain inclination angle so as to limit an opening size of the movable sheet 31. The injector reed valve 3 is disposed between the injector valve plate 1 and the injector plate 2 and attaches to the injector valve plate 1 such that the injector valve plate 1 plays a role in limiting an opening direction of the movable sheet 31. If the free end of the movable sheet 31 moves toward the injector valve plate 1, the injector valve plate 1 has a flat plate structure, so it is difficult for the injector valve plate 1 to provide a moving space for the movable sheet 31. In this manner, the movable sheet 31 can be opened only in a direction facing toward the injector plate 2, and the air in the compression cavity 500 is prevented from flowing backward into the vapor injection inlet cavity 4. Compared with a spring one-way valve of the related art, the one-way valve structure formed by the movable sheet 31, the injector valve plate 1 and the avoidance groove 21 does not need to be provided with parts such as a spring and a bolt, thereby reducing the number of parts and complexity, simplifying the structure of parts, reducing the cost, and meanwhile improving the sensitivity and stability.

In the vapor injection device, the rear housing 400 of the compressor is provided with the vapor injection port 402, and a part of the medium and high pressure refrigerant in the system is directly introduced into the compression cavity 500 of the compressor through the vapor injection device to increase the flow rate of the refrigerant so that the compressor can obtain higher heating capacity in the low-temperature environment.

Furthermore, an exhaust high-pressure cavity 9 is provided between the fixed scroll 300 and the rear housing 400, the exhaust high-pressure cavity 9 communicates with the exhaust port 401, and a central position of the fixed scroll 300 is provided with an exhaust hole that communicates with the exhaust high-pressure cavity 9, such that the air converged at the fixed scroll 300 enters the exhaust high-pressure cavity 9 through the exhaust hole after the refrigerant compression is completed and finally is discharged from the exhaust port 401.

Since not only the exhaust high-pressure cavity 9 but also the vapor injection inlet cavity 4 exists between the fixed scroll 300 and the rear housing 400, in order to avoid leakage between the fixed scroll 300 and the rear housing 400, the vapor injection device further includes a first sealing ring 5. The first sealing ring 5 is sleeved on the injector plate 2 and is disposed between the injector plate 2 and an inner wall of the rear housing 400. The first sealing ring 5 implements the radial seal between the injector plate 2 and the rear housing 400. A traditional sealing gasket is optimized to a sealing ring for seal so that the installation positioning and axial limit of the sealing gasket are prevented, the assemblability is increased, an axial pre-tightening force does not need to be increased, the assembly accuracy requirements and processes are reduced, the sealing surface does not need to be processed with a sealing groove, the structures of the parts are simple, and the manufacturing processes are reduced. Meanwhile, the first sealing ring 5 is configured to divide the inner wall of the rear housing 400 into the vapor injection inlet cavity 4 and the exhaust high-pressure cavity 9, and the first sealing ring 5 implements the isolation between the vapor injection inlet cavity 4 and the exhaust high-pressure cavity 9.

Furthermore, the vapor injection device further includes a second sealing ring 6, and the second sealing ring 6 is sleeved on the guide post 22 and disposed between the injector plate 2 and the fixed scroll 300. The radial seal between the injector plate 2 and the fixed scroll 300 is implemented by the sealing ring so that the axial pre-tightening force does not need to be increased, the installation is simpler, the sealing surface does not need to be processed with a sealing groove, the structures of the parts are simple, and the manufacturing processes are reduced. The axial rigid limit between the injector plate 2 and the fixed scroll 300 is not needed so a general fixing manner with a bolt is not adopted.

Both the first sealing ring 5 and the second sealing ring 6 adopt the radial seal, and there is no requirement for an axial sealing pressure, so that requirements for bolt installation and bolt torque are avoided, and man-hours and detection procedures are reduced.

It is to be understood that there is no sealing requirement between the injector reed valve 3 and the injector plate 2, thereby reducing parts and increasing the assemblability.

Furthermore, the vapor injection device further includes a snap spring 8, the snap spring 8 is sleeved on the injector plate 2 and disposed between the injector plate 2 and the rear housing 400 to limit a position of the injector plate 2 in an axial direction (an axial position of the injector plate). The snap spring 8 is disposed between the injector plate 2 and the rear housing 400 to perform axial limiting, and there is no requirement for the axial pre-tightening force. In an aspect, the inner wall of the rear housing 400 is provided with an annular groove for mounting the snap spring 8, an outer wall of the injector plate 2 is provided with a limiting step surface, and the snap spring 8 is inserted into the annular groove and abuts with the limiting step surface to implement the limit of the injector plate 2.

In order to ensure that the injector plate 2, the injector reed valve 3 and the injector valve plate 1 can be well positioned, the vapor injection device further includes a positioning member 7. In an aspect, the positioning member 7 is a positioning pin, and the positioning member 7 extends into the injector plate 2, the injector reed valve 3 and the injector valve plate 1 to achieve the positioning function. The injector plate 2 and the rear housing 400 are positioned through two positioning pins, one end of the positioning pin is inserted into the rear housing 400, and another end of the positioning pin passes through the injector valve plate 1, the injector reed valve 3, and the injector plate 2. The positioning pin plays a role in preventing dislocation and ensuring the installation angle, thereby reducing the possibility of dislocation in the assembly process, and further reducing the pressure drop in the air flow passage.

Furthermore, a movable gap is provided between the movable sheet 31 and the injector reed valve 3, and the movable gap has a U-shaped structure. In this manner, one end of the movable sheet 31 is connected to the injector reed valve 3 and another end of the movable sheet 31 is a free end so that a tongue-like shape is formed. With this structure, the movable sheet 31 has certain elasticity and can be moved to implement the opening and closing of the movable sheet 31.

In the description of the present disclosure, it is to be understood that the orientation or position relationships indicated by terms “above”, “below”, “right” and the like are based on the orientation or position relationships shown in the drawings, merely for facilitating description and simplifying operation, and these relationships do not indicate or imply that the referred device or component has a specific orientation and is constructed and operated in a specific orientation, and thus it is not to be construed as limiting the present disclosure. In addition, the terms “first” and “second” are merely used for descriptive purposes and have no special meanings.

In the description of the specification, the description of reference terms “one aspect” or “example” means that specific characteristics, structures, materials or features described in conjunction with the aspects or the examples are included in at least one aspect or example of the present disclosure. In the specification, the illustrative description of the preceding terms does not necessarily refer to the same aspect or example.

In addition, the above aspects are merely a preferred embodiment of the present disclosure and the technical principles used therein. It is to be understood by those skilled in the art that the present disclosure is not limited to the aspects described herein. Those skilled in the art can make various apparent modifications, adaptations and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the preceding aspects, the present disclosure is not limited to the preceding aspects and may further include more other equivalent aspects without departing from the concept of the present disclosure. The scope of the present disclosure is determined by the scope of the appended claims. 

What is claimed is:
 1. A vapor injection device for vapor injection of a compressor, wherein a rear housing of the compressor is provided with a vapor injection port, and the vapor injection device comprises: an injector valve plate disposed in the rear housing, wherein the injector valve plate is provided with a via hole; an injector plate disposed in the rear housing, wherein one side of the injector plate facing toward the injector valve plate is provided with an avoidance groove, a guide post is disposed protruding from one side of the injector plate facing away from the injector valve plate, the guide post is inserted into a fixed scroll of the compressor, an injection channel is disposed in the guide post, and a vapor injection inlet cavity is formed between the rear housing, the injector valve plate, and the fixed scroll; and an injector reed valve disposed between the injector valve plate and the injector plate, wherein the injector reed valve is attached to the injector valve plate, wherein the injector reed valve is provided with a movable sheet, and the movable sheet, the injector valve plate and the avoidance groove form a one-way valve structure such that a vapor injection refrigerant entering from the vapor injection port sequentially passes through the vapor injection inlet cavity, the via hole and the one-way valve structure and enters the fixed scroll through the injection channel.
 2. The vapor injection device of claim 1, wherein a movable gap is disposed between the movable sheet and the injector reed valve, and the movable gap has a U-shaped structure.
 3. The vapor injection device of claim 1, further comprising a first sealing ring, wherein the first sealing ring is sleeved on the injector plate and disposed between the injector plate and an inner wall of the rear housing.
 4. The vapor injection device of claim 3, wherein the first sealing ring is configured to divide the inner wall of the rear housing into the vapor injection inlet cavity and an exhaust high-pressure cavity.
 5. The vapor injection device of claim 1, further comprising a second sealing ring, wherein the second sealing ring is sleeved on the guide post and disposed between the injector plate and the fixed scroll.
 6. The vapor injection device of claim 1, further comprising a positioning member, wherein the positioning member extends into the injector plate, the injector reed valve, and the injector valve plate.
 7. The vapor injection device of claim 1, further comprising a snap spring, wherein the snap spring is sleeved on the injector plate and disposed between the injector plate and the rear housing to limit an axial position of the injector plate.
 8. A compressor, comprising a body, an orbit scroll, a fixed scroll, a rear housing and a vapor injection device which are sequentially connected, wherein the rear housing is provided with a vapor injection port, and the vapor injection device comprises: an injector valve plate disposed in the rear housing, wherein the injector valve plate is provided with a via hole; an injector plate disposed in the rear housing, wherein one side of the injector plate facing toward the injector valve plate is provided with an avoidance groove, a guide post is disposed protruding from one side of the injector plate facing away from the injector valve plate, the guide post is inserted into a fixed scroll of the compressor and provided with an injection channel, and a vapor injection inlet cavity is formed between the rear housing, the injector valve plate, and the fixed scroll; and an injector reed valve disposed between the injector valve plate and the injector plate, wherein the injector reed valve is attached to the injector valve plate, wherein the injector reed valve is provided with a movable sheet, and the movable sheet, the injector valve plate and the avoidance groove form a one-way valve structure such that a vapor injection refrigerant entering from the vapor injection port sequentially passes through the vapor injection inlet cavity, the via hole and the one-way valve structure and enters the fixed scroll through the injection channel, wherein a suction port is disposed on the body, the orbit scroll is disposed in the body and rotatable relative to the fixed scroll, and the vapor injection device is disposed between the fixed scroll and the rear housing and configured to supply air to the fixed scroll.
 9. The compressor of claim 8, wherein one side of the fixed scroll facing toward the orbit scroll is provided with a fixed scroll plate, one side of the orbit scroll facing toward the fixed scroll is provided with an orbit scroll plate, a compression cavity is formed between the fixed scroll plate and the orbit scroll plate, and the compression cavity is in communication with the suction port and the vapor injection device.
 10. The compressor of claim 9, wherein a bottom of the fixed scroll plate is provided with an injection hole, and the vapor injection device is in communication with the injection hole. 